Kaltura_Client_Exception thrown

Invalid KS "NGYwZGMwOTE5OTE4N2Y1YmM4MDJjODEyZmFhZjhkODRkYzUwY2NkYnwxMDE7OzE1MDA5OTM3NTk7MjsxNTAwOTA3MzU5LjcyMzM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"